What is the greenest type of bike frame?

Grist
By Ask Umbra®Mar 23, 2015, 6:02 am932 ptsInteresting
Q. What is the most ecologically sound choice for a bicycle frame – steel, aluminum, or carbon fiber? David B.Tucson, AZ A. Dearest David, I like your style. Not only are we talking bikes, the transportation darling of the green movement, but we’re talking the best bikes. Making a good thing even better is…

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